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They are still a "freshwater fish" that sometimes are found in areas (brackish) where there are wide swings in salinity. They are also found in pure freshwater as a natural environment but are never found in marine.
I don't want to confuse things, but there are indeed tonnes and TONNES of variables that affect a fish' lipids. Their environment and how cold it is, seasonal differences, when there's stress, at different ages and even different diets, on and on. You could write a book like War and Peace on the topic of lipids alone.
If you open up a freshwater fish and a saltwater fish, you won't be able to tell the difference physically, yet their physiological functions differ and one of those differences has to do with their ability to "process" different fats.
I don't want to confuse things, but there are indeed tonnes and TONNES of variables that affect a fish' lipids. Their environment and how cold it is, seasonal differences, when there's stress, at different ages and even different diets, on and on. You could write a book like War and Peace on the topic of lipids alone.
If you open up a freshwater fish and a saltwater fish, you won't be able to tell the difference physically, yet their physiological functions differ and one of those differences has to do with their ability to "process" different fats.